The Narcissist's body language: "Haughty". The narcissist adopts a physical posture which implies and exudes an air of superiority, seniority, hidden powers, mysteriousness, amused indifference, etc. Though the narcissist usually maintains sustained and piercing eye contact, he often refrains from physical proximity (he maintains his personal territory).
The psychopath is likely to be expansive (dominate and invade other people's personal territory), swaggering, and vaguely menacing. His manifest equanimity is bound to be mixed with an underlying streak of agitation, violent impatience, and hypervigilance. The general impression is of a wound time bomb, about to explode.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 3 DVDs with 16 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)